<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        show-icon
        :closable="false"
      >
      </el-alert>
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <el-tabs v-model="activeName" @tab-click="handleClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
          <el-table
            :data="manyTableData"
            border
            stripe
          >
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index, scope.row)">{{item}}</el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditParam(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeAttrById(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
          <el-table
            :data="onlyTableData"
            border
            stripe
          >
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable>{{item}}</el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditParam(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeAttrById(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
<!--    添加参数对话框-->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText + '：'" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取消</el-button>
        <el-button type="primary" @click="addParams">确定</el-button>
      </span>
    </el-dialog>
<!--    修改参数-->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
    >
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText + '：'" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取消</el-button>
        <el-button type="primary" @click="editParamInfo">确定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Params',
  data () {
    return {
      cateList: [],
      selectedCateKeys: [],
      activeName: 'many',
      manyTableData: [],
      onlyTableData: [],
      addDialogVisible: false,
      addForm: {
        attr_name: ''
      },
      editDialogVisible: false,
      editForm: {
        attr_name: '',
        attr_id: ''
      },
      inputVisible: false,
      inputValue: '',
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  computed: {
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    cateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.cateList = res.data
    },
    handleChange () {
      this.getParamsData()
    },
    handleClick () {
      this.getParamsData()
    },
    async getParamsData () {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.onlyTableData = []
        this.manyTableData = []
        return
      }
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      this.$message.success('获取参数列表成功！')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        item.inputVisible = false
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    async removeAttrById (id) {
      console.log(id)
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    async showEditParam (id) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数失败！')
      }
      this.editForm.attr_name = res.data.attr_name
      this.editForm.attr_id = res.data.attr_id
      this.editDialogVisible = true
    },
    editParamInfo () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }
        this.$message.success('修改参数成功！')
      })
    },
    showInput (row) {
      row.inputVisible = true
      // $nextTick 方法的作用：就是当页面上的元素被重新渲染之后，才会执行回调函数中的代码。
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    async saveAttrVals (row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数失败！')
      }
      this.$message.success('修改参数成功！')
    },
    handleClose (index, row) {
      row.attr_vals.splice(index, 1)
      this.saveAttrVals(row)
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
  margin: 15px 0;
}

.el-tag{
  margin: 10px;
}

.input-new-tag{
  width: 120px;
}
</style>
